Question

The perimeter of a triangle is 57 cm. if two side are 18 cm and 13 cm,find the third side

Answer 1

$57 = 18 + 13 + x$
$31 + x = 57$
$x = 57 - 31$
$x = 26$

Answer 2

$18 + 13 + x = 57 \\ 31 + x = 57 \\ x = 57 - 31 \\ x = 26$

here X is the 3rd side
so here 3rd side =26cm.....
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